Medical device communications network

ABSTRACT

A medical device communications network comprises a plurality of medical devices including either or both of a first number of surgical instruments and a second number of implants configured for subcutaneous implantation in a biological body. A corresponding plurality of wireless communication circuits are each mounted to a different one of the plurality of medical devices. Each of the plurality of wireless communication circuits is configured to broadcast medical device information relating to the medical device to which it is mounted and to receive information relating to any other of the plurality of medical devices. The network may or may not include a master wireless communications circuit configured to receive the medical device information broadcast by any of the plurality of slave wireless communication circuits and to broadcast the information relating to any other of the plurality of medical devices.

FIELD OF THE INVENTION

The present invention relates generally to systems for conducting wireless communications, and more specifically to such systems for communicating information relating to medical devices such as surgical instruments, medical implant devices, computer assisted surgery devices, and the like.

BACKGROUND

During the lifetime of a patient, it may be desirable to perform one or more surgical procedures on the patent as a result of, for example, disease or trauma. A number of medical implants, surgical instruments and computer assisted surgery devices may be utilized during the performance of such a procedure.

SUMMARY

The present invention may comprise one or more of the features recited in the attached claims, and/or one or more of the following features and combinations thereof. A medical device communications network may comprise a plurality of medical devices including either or both of a first number of surgical instruments and a second number of implants configured for subcutaneous implantation in a living biological body, and a corresponding plurality of wireless communication circuits each mounted to a different one of the plurality of medical devices. Each of the plurality of wireless communication circuits may be configured to broadcast medical device information, wherein the medical device information relates to the medical device to which it is mounted, and to receive information relating to any other of the plurality of medical devices. At least one of the first number of surgical instruments may be controlled by a computer aided surgery device.

Each of the plurality of wireless communications circuits may include a visual indicator. Each of the plurality of wireless communications circuits may control operation of its corresponding visual indicator based on the information relating to any other of the plurality of medical devices. Each of the plurality of wireless communication circuits may be operable to activate its corresponding visual indicator if the medical device to which it is mounted is incompatible with any other of the plurality of medical devices. Alternatively or additionally, each of the plurality of wireless communication circuits may be operable to activate its corresponding visual indicator if the medical device to which it is mounted is being used out of order relative to an established medical device usage sequence.

Alternatively or additionally, each of the plurality of wireless communications circuits may include an audible indicator. Each of the plurality of wireless communications circuits may control operation of its corresponding audible indicator based on the information relating to any other of the plurality of medical devices. Each of the plurality of wireless communication circuits may be operable to activate its corresponding audible indicator if the medical device to which it is mounted is incompatible with any other of the plurality of medical devices. Alternatively or additionally, each of the plurality of wireless communication circuits may be operable to activate its corresponding audible indicator if the medical device to which it is mounted is being used out of order relative to an established medical device usage sequence.

In one embodiment, the network does not include a master communications device and instead information relating to any other of the plurality of medical devices includes the medical device information broadcast by any other of the plurality of medical devices.

In another embodiment, each of the plurality of wireless communication circuits may be a slave wireless communication circuit. The network in this embodiment may further include a master wireless communication circuit configured to receive the medical device information broadcast by any of the plurality of slave wireless communication circuits and to broadcast the information relating to any other of the plurality of medical devices. Each of the slave wireless communication circuits may include a visual or audible indicator operable as described above. Alternatively or additionally, the master wireless communications circuit may include a visual indicator. The master wireless communications circuit may control operation of the visual indicator based on the information broadcast by any of the plurality of slave wireless communication circuits. The master wireless communication circuit may be operable to activate the visual indicator if any of the plurality of medical devices are incompatible with each other. Alternatively or additionally, the master wireless communication circuit may be operable to activate the visual indicator if any of the plurality of medical devices are used out of order relative to an established medical device usage sequence. Alternatively or additionally, the master wireless communications circuit may include an audible indicator. The master wireless communications circuit may control operation of the audible indicator based on the information broadcast by any of the plurality of slave communication circuits. The master wireless communication circuit may be operable to activate the audible indicator if any of the plurality of medical devices are incompatible with each other. Alternatively or additionally, the master wireless communication circuits may be operable to activate the audible indicator if any of the plurality of medical devices are used out of order relative to an established medical device usage sequence.

An additional wireless communication circuit may be introduced into the network. The additional wireless communication network may be configured to become the master communication circuit when introduced into the network. If the network includes an existing master wireless communication circuit, the existing master wireless communication circuit may then become another of the slave wireless communication circuits.

These and other features of the present invention will become more apparent from the following description of the illustrative embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram of one illustrative embodiment of a medical device communications network.

FIG. 2 is a diagram of another illustrative embodiment of medical device communications network

FIG. 3 is a schematic diagram of one illustrative embodiment of a wireless communication circuit carried by the one or more medical devices of the network of either of FIG. 1 or 2.

DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENTS

For the purposes of promoting an understanding of the principles of the invention, reference will now be made to a number of illustrative embodiments illustrated in the drawings and specific language will be used to describe the same.

Referring now to FIG. 1, a diagrammatic illustration of one illustrative embodiment of a wireless network environment 10 is shown in the context of a portion of an operating room or other space for performing surgical procedures. In the illustrated embodiment, the wireless network environment 10 includes a communications controller 12, a number, M, of surgical instruments 20 ₁-20 _(M), and a number, N, of medical implants 30 ₁-30 _(N), wherein M and N may each be any positive integer. The communications controller 12 includes a wireless communications circuit 13 having a wireless transceiver circuit 14 electrically connected to either one, or both of, an audible indicator 16 and a visual indicator 18. The audible indicator 16 may be any conventional electronically actuatable audible device responsive to an electrical activation signal to emit a natural or synthesized audible sound. Examples of conventional devices that may be used as the audible indicator 16 include, but are not limited to, a bell, a buzzer, a chime, or any other audible device configured to produce a single one, series or sequence of sounds in response to the activation signal. The visual indicator 18 may likewise be any conventional device responsive to an electrical activation signal to emit, produce or display a visible event. Examples of conventional devices that may be used as the visual indicator 18 include, but are not limited to, one or more lamps, light emitting diodes (LEDs), vacuum fluorescent, liquid crystal or other types of displays, monitors or the like.

Each of the number, M, of medical instruments 20 ₁-20 _(M) includes a wireless communications circuit 13 having a wireless transceiver circuit 14 which may be electrically connected to either one, or both of, an audible indicator 16 and a visual indicator 18, wherein the devices 14, 16 and 18 may be as described hereinabove. Additionally, the wireless transceiver circuit 14 may be electrically coupled or connected to an instrument drive mechanism 22 configured to control one or more functional operations of the medical instrument. The wireless transceiver circuits 14 carried by each of the number, M, of medical instruments 20 ₁-20 _(M) are configured to share information with the wireless transceiver circuit 14 of the communications controller 12 via corresponding wireless communication paths 24 ₁-24 _(M). Any one or more of the medical instruments 20 ₁-20 _(M) may be controlled by a computer aided surgery device (not shown).

The number N of medical implants 30 ₁-30 _(N) also have mounted thereto a wireless communication circuit 13 having a wireless transceiver circuit 14 which may be electrically connected to either one, or both of, an audible indicator 16 and a visual indicator 18, wherein the devices 14, 16 and 18 may be as described hereinabove. At any time during a surgical procedure, any one or more of the medical implants 30 ₁-30 _(N) may be resident within a living biological body 32, as shown by example for the medical implant 30 _(N) or may instead be external to the biological body 32 as shown by example with the medical implant 30 ₁. In any case, the wireless transceiver circuits 14 of the medical implant 30 ₁-30 _(N) are configured to share information with the wireless transceiver circuit 14 of the communications controller 12 via corresponding wireless communication paths 34 ₁-34 _(N). In the embodiment illustrated in FIG. 1, the communications controller 12 operates as a “master” or “hub” device and is accordingly operable in a conventional manner to receive all communications from any one or more of the medical instruments 20 ₁-20 _(M) and any one or more of the medical implants 30 ₁-30 _(N), and to selectively transmit information back to any one or more of the medical instruments 20 ₁-20 _(M) and/or medical implants 30 ₁-30 _(N). The communications controller 12 continuously performs device discovery by monitoring information broadcast by any one or more of the medical instruments 20 ₁-20 _(M) and any one or more of the medical implants 30 ₁-30 _(N). In this configuration, each of the medical instruments 20 ₁-20 _(M) and medical implants 30 ₁-30 _(N) are configured to continually broadcast a device identification code (device ID) unique to that device, and the communications controller 12 is accordingly operable to continually determine and monitor the presence of all medical instruments 20 ₁-20 _(M) and medical implants 30 ₁-30 _(N) that are within the wireless communications network environment 10.

Examples of information that may be transmitted from any one or more of the medical instruments 20 ₁-20 _(M) include, but are not limited to medical instrument model, type and/or ID as well as any functional information relating to the operability, operating state and/or operating conditions of the medical instrument. Examples of such medical instrument functionality include, but are not limited to, battery charge, estimated battery charge remaining, ON/OFF state of the medical instrument, operating speed of the medical instrument, or the like. Examples of information that may be transmitted to the wireless communication module 14 of the communications controller 12 from any one or more of the medical implants 30 ₁-30 _(N) include, but are not limited to implant model, type, ID, and the like.

The communications controller 12 is generally operable to monitor the types and sequences of the medical instruments 20 ₁-20 _(M) and medical implants 30 ₁-30 _(N) used in a medical procedure to ensure that appropriate instruments are matched with appropriate devices, and that the medical procedure being performed is carried out according to a predefined sequence of steps and/or that the medical instruments 20 ₁-20 _(M) and/or medical implants 30 ₁-30 _(N) are used in a predefined sequence. The communications controller 12 is configured to provide an audible or visual warning to the user, via any one or more of the audible indicators 16 and/or visual indicators 18 associated with the communication controller 12 and/or appropriate ones of the medical instruments 20 ₁-20 _(M) and/or medical implants 30 ₁-30 _(N), in any of a number of scenarios. One example scenario may occur when, by processing information broadcast by the various medical instruments 20 ₁-20 _(M) and medical implants 30 ₁-30 _(N), the communications controller 12 determines that one or more of the medical instruments 20 ₁-20 _(M) and/or medical implants 30 ₁-30 _(N) is/are incompatible with any one or more other ones of the medical instruments 20 ₁-20 _(M) and/or medical implants 30 ₁-30 _(N). Another example scenario may occur when, by processing information broadcast by the various medical instruments 20 ₁-20 _(M) and medical implants 30 ₁-30 _(N), the communications controller 12 determines that one of the medical instruments 20 ₁-20 _(M) and/or medical implants 30 ₁-30 _(N) is being used in an incorrect order, according to a specified medical device usage sequence or surgical technique, relative to the other ones of the medical instruments 20 ₁-20 _(M) and/or medical implants 30 ₁-30 _(N). Other example scenarios will occur to those skilled in the art, and any such scenarios are contemplated by the present disclosure.

Referring now to FIG. 2, a diagrammatic illustration of another illustrative embodiment of a wireless network environment 10′ is shown in the context of a portion of an operating room or other space for performing surgical procedures. In the illustrated embodiment, the wireless network environment 10′ includes a number, M, of surgical instruments 20 ₁-20 _(M), and a number, N, of medical implants 30 ₁-30 _(N), wherein M and N may each be any positive integer.

Each of the number, M, of medical instruments 20 ₁-20 _(M) includes a wireless communications circuit 13 having a wireless transceiver circuit 14 which may be electrically connected to either one, or both of, an audible indicator 16 and a visual indicator 18, wherein the devices 14, 16 and 18 may be as described hereinabove. Additionally, the wireless transceiver circuit 14 may be electrically coupled or connected to an instrument drive mechanism 22 configured to control one or more functional operations of the medical instrument. The wireless transceiver circuits 14 carried by each of the number, M, of medical instruments 20 ₁-20 _(M) are configured to broadcast and receive information via corresponding wireless communication paths 52 ₁-52 _(M). Any one or more of the medical instruments 20 ₁-20 _(M) may be controlled by a computer aided surgery device (not shown).

The number N of medical implants 30 ₁-30 _(N) also have mounted thereto a wireless communication circuit 13 having a wireless transceiver circuit 14 which may be electrically connected to either one, or both of, an audible indicator 16 and a visual indicator 18, wherein the devices 14, 16 and 18 may be as described hereinabove. At any time during a surgical procedure, any one or more of the medical implants 30 ₁-30 _(N) may be resident within a living biological body 32, as shown by example for the medical implant 30 _(N) or may instead be external to the biological body 32 as shown by example with the medical implant 30 ₁. In any case, the wireless transceiver circuits 14 of the medical implant 30 ₁-30 _(N) are configured to broadcast and receive information via corresponding wireless communication paths 54 ₁-54 _(N).

In the embodiment illustrated in FIG. 2, the wireless network environment 10′ does not include a master or hub device, and instead each of the medical instruments 20 ₁-20 _(M) are configured to receive information broadcast by any one or more of the medical implants 30 ₁-30 _(N), and vice versa. In this configuration, each of the medical instruments 20 ₁-20 _(M) and medical implants 30 ₁-30 _(N) is configured to continually broadcast a device identification code (device ID) unique to that device, and all others of the medical instruments 20 ₁-20 _(M) and medical implants 30 ₁-30 _(N) within the wireless network environment 10′ are configured to receive the broadcast ID information. Examples of information that may be transmitted from any one or more of the medical instruments 20 ₁-20 _(M) and medical implants 30 ₁-20 _(N) include, but are not limited to medical instrument model, type and/or ID.

The wireless network illustrated in FIG. 2 is generally operable to monitor the types and sequences of the medical instruments 20 ₁-20 _(M) and medical implants 30 ₁-30 _(N) used in a medical procedure to ensure that appropriate instruments are matched with appropriate devices, and that the medical procedure being performed is carried out according to a predefined sequence of steps and/or that the medical instruments 20 ₁-20 _(M) and/or medical implants 30 ₁-30 _(N) are used in a predefined sequence. Each of the wireless communication circuits 13 is configured to broadcast information relating to the medical instrument 20 ₁-20 _(M) or medical implant 30 ₁-30 _(N) to which it is mounted, and to receive information relating to any other of the medical instrument 20 ₁-20 _(M) or medical implant 30 ₁-30 _(N). Each of the wireless communication circuits 13 carried by the various medical instruments 20 ₁-20 _(M) and medical implants 30 ₁-30 _(N) is configured to provide an audible or visual warning to the user, via a corresponding audible indicator 16 and/or visual indicators 18, in any of a number of scenarios. One example scenario may occur when the wireless communication circuit 13 of any one or more of the medical instruments 20 ₁-20 _(M) and/or medical implants 30 ₁-30 _(N) determines that the associated medical instrument 20 ₁-20 _(M) or medical implant 30 ₁-30 _(N) is incompatible with any one or more other ones of the medical instruments 20 ₁-20 _(M) and/or medical implants 30 ₁-30 _(N). Another example scenario may occur when the wireless communication circuit 13 of any one or more of the medical instruments 20 ₁-20 _(M) and/or medical implants 30 ₁-30 _(N) determines that one of the medical instruments 20 ₁-20 _(M) and/or medical implants 30 ₁-30 _(N) is being used in an incorrect order, according to a specified medical device usage sequence or surgical technique, relative to the other ones of the medical instruments 20 ₁-20 _(M) and/or medical implants 30 ₁-30 _(N). Other example scenarios will occur to those skilled in the art, and any such scenarios are contemplated by the present disclosure.

Referring now to FIG. 3, a schematic diagram of one illustrative embodiment of the wireless communications circuit 13 of FIGS. 1 and 2 is shown. Central to the wireless communication circuit 13 is a wireless transceiver circuit 14 including a transceiver circuit 60 operable to broadcast information using conventional wireless communications technology. The transceiver circuit 60 may be, for example, an nRF241E1, 2.4 GHz RF transceiver/transmitter that is commercially available through Nordic Semi-Conductor ASA of Tiller, Norway, although the present disclosure contemplates that the transceiver circuit 60 may alternatively be any known transceiver circuit capable of broadcasting information in the radio frequency range (e.g., 402-405 MHz or so-called MICS band) or other frequency range including, but not limited to, sub radio frequencies, or other conventional protocols including, but not limited to, Bluetooth©, ZigBee©, Wi-Fi, Wireless USB, and the like. The transceiver circuit 60 operates at a supply voltage, VDD, and at a clock frequency generated by a conventional crystal 68. The crystal 68 in the illustrated embodiment is a 16 MHz crystal, although crystals operating at other clock frequencies may be used.

The wireless transceiver circuit 14 further includes a voltage source supplying the operating voltage VDD. In one embodiment, for example, the voltage source may be provided in the form of a conventional secondary coil circuit 62 configured to inductively couple to a conventional primary coil circuit. In this embodiment, the secondary coil circuit includes a conventional secondary inductive coil that is electrically connected to a conventional AC-to-DC conversion circuit. When an energized primary coil (not shown) inductively couples with the secondary coil, an AC voltage is induced in the secondary coil according to known physical principles. The induced AC voltage is converted to the supply voltage, VDD, by the AC-to-DC conversion circuit. This DC voltage may be supplied directly to the VDD supply line (e.g., VDD0 and VSS2), or may alternatively be provided to a rechargeable voltage source 64 interposed between the secondary coil circuit 62 and the operating voltage supply line as shown in phantom in FIG. 3. In the former case, the wireless transceiver circuit 14 has no internal voltage source, and may be activated for operation only when the secondary coil circuit 14 is inductively coupled to an activated primary coil circuit. Such a supply voltage arrangement will typically be implemented with the wireless communication circuits 13 mounted to any one or more of the medical implants 30 ₁-30 _(N). In the latter case, the rechargeable voltage source 64 is operable to produce the operating voltage, VDD, for some time period between recharging events. When this embodiment is implemented in any of the wireless communication circuits 13 mounted to any one or more of the medical implants 30 ₁-30 _(N), however, the secondary coil circuit 62 must be periodically coupled to an activated primary coil circuit so that the secondary coil circuit 62 produces the DC supply voltage, VDD, for a sufficient time to recharge the rechargeable voltage source 64. The wireless communication circuit 13 mounted to any of the medical instruments 20 ₁-20 _(M) and/or carried by the communications controller 12, need not include the secondary coil circuit 62, and may instead include only a conventional rechargeable or non-rechargeable voltage source supplying the supply voltage, VDD. The wireless communication circuits 13 mounted to the various medical instruments 20 ₁-20 _(M) and medical implants 30 ₁-30 _(N) are, in one embodiment, configured to be mounted to the devices in a manner that allows for repeated attachment and detachment of the circuits 13 from their respective devices to facilitate cleaning, sterilization, etc. of the various medical instruments 20 ₁-20 _(M) and medical implants 30 ₁-30 _(N). This feature further allows the circuits 13 to be removed from their respective medical implants 30 ₁-30 _(N), if desired, after implantation thereof.

In the embodiment illustrated in FIG. 3 wherein the transceiver circuit 60 is a nRF241E1, 2.4 GHz RF transceiver/transmitter produced by Nordic Semi-Conductor, such a transceiver circuit does not include sufficient memory for storage of program code and/or any generated data. Accordingly, a separate memory circuit 66 is provided for the purpose of storing one or more executable algorithms and/or storing data. In the illustrative embodiment, the memory circuit 66 is a 4.0 Kbyte serial EEPROM that is commercially available through any number of semiconductor manufacturers. In other embodiments, the transceiver circuit 60 may include sufficient on-board memory, in which case the memory circuit 66 may be omitted.

In the illustrated embodiment, the wireless transceiver circuit 14 is configured for short-range wireless communication, and in this regard a single-ended antenna 70 is connected via a differential-to-single ended matching network, comprising L1, L2, C3-C4 and C11-C13 to differential antenna inputs, ANT1 and ANT2, of the transceiver circuit 60. In the illustrated embodiment, the antenna 70 is a 50 OHM antenna that may be implemented in any variety of known antenna configurations.

The wireless communication circuit 13 may include one or more sensors producing sensor signals indicative of one or more corresponding operating conditions of the medical device with which the wireless communication circuit 13 is associated. For example, the wireless communication circuit 13 may be mounted to a medical implant, as illustrated in FIGS. 1 and 2, that is then subsequently implanted into living biological tissue. In this case, one or more sensors may be suitably positioned relative to the medical implant to provide one or more corresponding sensor signals indicative of one or more corresponding operating characteristics of the implant. Examples of such operating characteristics may include, but are not limited to, temperature, load, strain, torque and the like. As another example, the wireless communication circuit 13 may be mounted to a surgical instrument as illustrated in FIGS. 1 and 2. In this case, one or more sensors may be suitably positioned relative to the surgical instrument to provide one or more corresponding sensor signals indicative of one or more corresponding operating parameters of the surgical instrument. Alternatively or additionally, the surgical instrument may be part of a computer assisted surgery device, and may in such cases be controlled by the computer assisted surgery device. In such cases, one or more sensors may be suitably positioned relative to the surgical instrument and/or one or more of the computer assisted surgery components to provide one or more corresponding sensor signals indicative of one or more corresponding operating parameters of the computer assisted surgery device. In either case, examples of such operating parameters may include, but are not limited to, instrument (e.g., saw, drill, etc.) speed, implement position, implement operating direction, instrument operating temperature, and the like. In the embodiment illustrated in FIG. 3, the wireless communication circuit 13 may include a general operating condition sensor 72 as shown in phantom, which may be or include any sensor of the foregoing type that is electrically connected to one of the analog inputs, e.g., AIN0, of the transceiver circuit 60. Sensory data produced by the sensor 72 may be routed by the transceiver circuit 60 to the memory circuit 66 for storage therein and subsequent wireless transmission via the antenna 70 within the wireless communication network illustrated in either of FIGS. 1 and 2. Alternatively, the transceiver circuit 60 may be operable to transmit the sensory data in real time via the antenna 70 in a conventional manner.

The wireless communication circuit 13 may further include either one or both of an audible indicator 16 and a visual indicator 18 of the types described hereinabove. In the illustrated embodiment, for example, an audible indicator 16 may be electrically connected to a digital or analog output (e.g., DI03) of the transceiver circuit 60 and the visual indicator 18 may also be electrically connected to a digital or analog output (e.g., DI04) of the transceiver circuit 60. The transceiver circuit 60 is operable to control operation of the audible indicator 16 and/or visual indicator 18, as described hereinabove, in a conventional manner.

The remaining electrical components illustrated in FIG. 3 are provided to support operation of the transceiver circuit 60 and memory circuit 66. Typical values of the illustrated components for one specific implementation of the wireless communication circuit 13 are provided in the following Table 1. In this specific implementation of the wireless communication circuit 13, the rechargeable voltage source 64 is not included, and the operating condition sensor 72 is implemented as a single temperature sensor. It will be understood that such component values are provided only way of example, and that other component values may be used.

TABLE 1 Component Physical Identification Description Size Value Tolerance Units C1 Ceramic Capacitor, 50 V, NPO 0603/0402 22 ±5% pF C2 Ceramic Capacitor, 50 V, NPO 0603/0402 22 ±5% pF C3 Ceramic Capacitor, 50 V, NPO 0603/0402 22 ±5% pF C4 Ceramic Capacitor, 50 V, X7R 0603/0402 2.2 ±10%  nF C5 Ceramic Capacitor, 50 V, X7R 0603/0402 1.0 ±10%  nF C6 Ceramic Capacitor, 50 V, X7R 0603/0402 10 ±10%  nF C7 Ceramic Capacitor, 50 V, X7R 0603/0402 10 ±10%  nF C8 Ceramic Capacitor, 50 V, X7R 0603/0402 1.0 ±10%  nF C9 Ceramic Capacitor, 50 V, X7R 0603/0402 1.0 ±10%  nF C10 Ceramic Capacitor, 50 V, X7R 0603/0402 33 ±10%  nF C11 Ceramic Capacitor, 50 V, NPO 0603/0402 1.0 ±0.25 pF pF C12 Ceramic Capacitor, 50 V, NPO 0603/0402 1.0 ±0.25 pF pF C13 Ceramic Capacitor, 50 V, NPO 0603/0402 1.5 ±0.25 pF pF C14 Ceramic Capacitor, 50 V, X7R 0603/0402 10 ±10%  nF L1 Inductor, wire wound 0603/0402 3.6 ±5% nH L2 Inductor, wire wound 0603/0402 22 ±5% nH R1 Resistor 0603/0402 1.0 ±1% Mohm R2 Resistor 0603/0402 22 ±1% Kohm R3 Resistor 0603/0402 10 ±1% Kohm R4 Resistor 0603/0402 10 ±1% Kohm 60 nRF241E1 (Nordic VLSI) QFN36/6 × 6 66 4 Kbyte serial EEPROM with SPI interface SO8 2XX320 68 Crystal, C_(L) = 12 pF, ESR < 100 ohm L × W × H = 4.0 × 2.5 × 0.8 16 +/−30 ppm MHz 72 LM62 2.7 V, 15.6 mV/° C. Temperature Sensor SOT-23 (National Semiconductor)

While the invention has been illustrated and described in detail in the foregoing drawings and description, the same is to be considered as illustrative and not restrictive in character, it being understood that only illustrative embodiments thereof have been shown and described and that all changes and modifications that come within the spirit of the invention are desired to be protected. For example, the present disclosure contemplates that either of the networks illustrated and described with respect to FIGS. 1 and 2 may be configured in a known manner to recognize the introduction of a “superior” master device, such as another controller or computer assisted surgery (CAS) device into the network field or environment 10 or 10′. In such cases, the “superior” master device will assume control over the communications in the same manner as described hereinabove with respect to the communications controller 12. In networks that have a communications controller 12, the superior master device will assume control and the controller 12 will be relegated to the status of a slave wireless communication circuit similar to the wireless communication circuits 13 mounted to the various medical devices 20 ₁-20 _(M) and 30 ₁-30 _(N). This feature allows a newly introduced wireless communication device or controller with one or more superior or desirable features to assume control of the communications environment. Examples of some such superior or desirable features include, but are not limited to, superior data processing power, longer battery life, or other desirable metric. 

1. A medical device communications network comprising: a plurality of medical devices including a first number of surgical instruments and a second number of implants configured for subcutaneous implantation in a living biological body, a corresponding plurality of slave wireless communication circuits each mounted to a different one of the plurality of medical devices, each of the plurality of slave wireless communication circuits configured to broadcast medical device information relating to the medical device to which it is mounted, and to receive information relating to any other of the plurality of medical devices, a master wireless communication circuit configured to receive the medical device information broadcast by any of the plurality of slave wireless communication circuits and to broadcast the information relating to any other of the plurality of medical devices, an additional wireless communication circuit to be introduced into the network, the additional wireless communication circuit configured to become the master communication circuit when introduced into the network with the existing master wireless communication circuit then becoming another of the slave wireless communication circuits.
 2. A medical device communications network comprising: a plurality of medical devices, a corresponding plurality of slave wireless communication circuits each mounted to a different one of the plurality of medical devices, each of the plurality of slave wireless communication circuit configured to broadcast information relating to the medical device to which it is mounted and to receive information relating to any other of the plurality of medical devices, a master wireless communication circuit configured to receive the information broadcast by any of the plurality of slave wireless communication circuits and to broadcast the information relating to any other of the plurality of medical devices, and an additional wireless communication circuit to be introduced into the network, the additional wireless communication circuit configured to become the master communication circuit when introduced into the network with the existing master wireless communication circuit then becoming another of the slave wireless communication circuits. 